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En relación a la actualización de la declinación magnética:On updating magnetic variation:

Show the answer

Correct answer: c) Add or subtract the annual change shown on our chart, multiplied by the years elapsed.

Why it is correct

The chart gives variation for a year and its annual change. Multiply by years elapsed and add or subtract.

Why the others are not

  • a) Not by radio.
  • b) Changes yearly.
  • d) Only c.

How to work it out in the exam

  1. Update variation: annual change × years.

Where this question comes from

Try it: Navigation calculations

Pending instructor review. Machine translation, not reviewed.